function Person(name, age) {
    this.name = name;
    this.age = age;
}
Person.prototype.setAge = function () {
    console.log(111);
}

function Student(name, age, price) {
    Person.call(this, name, age)
    this.price = price;
    this.setScore = function () { }
}
Student.prototype = Object.create(Person.prototype)
Student.prototype.constructor = Student
